Duplex envelope



Patented Aug. 27, 1929.

estrae stares PATENT OFFICE.

WALTER J'. BINDER, OF FORT THOMAS, KENTUCKY, .ASSIGNOR TO SPECIALTY EN- VELOPE COMPANY, F NEWPORT, KENTUCKY, A CORPORATION OF KENTUCKY.

DUPLEX ENVELOPE.

` Application filed June 24,

This invention relates to improvements in duplex envelopes and has for its .object the production of lan envelope that is cheaper to manufacture than the envelopes heretofore used. l

Another object of this invention is to provide a duplex envelope the main portion of which is made from a single sheet and can be formed With one die and in one stamping operation. v

These and other objects are attained by the means described herein and disclosed in the accompanying drawings, in which:

Fig. 1 is a plan view of a blank from Which the envelope is formed.

Fig 2 is a rear plan vievv of an envelope embodying this invention.

Fig. 3 is a front plan view of an envelope embodying this invention.

Fig. d is a sectional vieu taken on line 1 4 of -lig. 8. f

Fig. 5 is a sectional view taken on line 5 5 of Fig. 3.

'll he duplex envelope of this invention comf prises a sheet of material having a flap l1 extending from one edge 12 of the blank 10 and a pair of flaps 120 and 13 extending from the edge 14 of the blank 10. The sheet 10 is divided into three sections 15, 16 and 17 by folds 18 and 19, the folds being shown on the drawing by dotted lines respectively marked 18 and 19. rPhe portions 15 and 17 when folded upon the rear surface of the section 16 and secured together constitute the back of the envelope While the section 16 constitutes the front of the envelope. lThe shaded portion 2O at the upper end of the back s ection represents glue or gum by means of which the tivo back sections are sealed together and form a seam 21, see Fig. 2.

A rectangular patch or piece of material 22 is secured at two of its edges 23 and 211 to the rear surface of the front section 16. The strip or patch 22 is preferably secured to the front 16 in the lower right hand corner, as shown in Fig. 3. 'lhe free edge 25 of the strip or patch 22 is held in close proximity With the front sect-ion 16 of the envelope by the fold 18. The remaining free edge 26 of the strip 22 is secured to the back section 15 by means of glue or paste as shown by the shaded portion 27 on the back section 15.

After the patch 22 has been secured to the front section 16 of the envelope as above de- 1927. Serial No. 201,244.

scribed the back sections 15 and 17 are then secured in position.

The ilap 12 carried by the edge 14 of the envelope blank is now pasted to the back section 17 by means of the gum or paste'28 carried thereon and the envelope is ready for use.

Any conventional closing method or meansv may be employed, such as shown herein, namely, a button 29 is secured to the flap 11 carried by the edge 12 from Which a. string 30 extends for attachment With a second button 31 carried by the back of the envelope. Access is had to the larger compartment of the duplex envelope through the opening beneath the llap 11 While access to the smaller compartment is had through the opening beneath the flap 13.

If desired a Window 32 may be cut in the front of the venvelope into the smaller compartment so that an address Within the smaller compartment may be observed from the outside.

It should be noted that there is no visible evidence of the duplex characteristic of the venvelope and in order to apprize the recipient of the envelope of the nature thereof the lower right hand corner may be blocked olf or suitable indicia, such as shown in Fig. 3, may be placed upon the face of the envelope to indicate the contents thereof. It should also be noted that the face of the envelope is unbroken and free from flaps, as is the case With the duplex envelopes now generally employed.

l/Vhat is claimed is- 1. A duplex envelope having a large and a small compartment for mail matter of different classes comprising a sheet foldable upon itself to form the larger compartment, the larger compartment having a back and a front, the front being a continuous unbroken piece and the back having twosections, said sections being integral with opposed edges of the front7 the sections overlapping one another and forming a seam along the center of the back, a flap carried by one end of the front for aecessibly closing one end of the larger compartment, a second flap carried by the other edge of the front and secured to one of the back sections for inaccessibly sealing a portion of the other end of the larger compartment, a patch havingL tvvo of its edges secured to the rear surface of the front and having a third edge secured to the second section of' the back to form the smaller compartment, the second lap secured to the first section of the back and the third edge of the patch secured to the second section of the back forming a completely inaccessible seal for the other end of the larger compartment, the smaller compartment having its fourth edge disposed unsecured in the fold at the juncture of the front and second section of the back, and a third flap for inaccessibly sealing the smaller compartment after the mail able matter has been placed therein.

2. A duplex envelope comprisinga blank 'Foldable upon itself to provide one compartment/,said blank having iaps 'forming a back and a closing member for said compartment and further having a pair of liaps one end and a patch secured at tvvo adjacent edges upon the rear face of the blank, a third edge oi the patch being retained in the fold oi one of thev back flaps, the aforesaid pair oit end flaps. being separately closable, one for completing the first mentioned compartment,

and the other for sealing the compartment beneath the patch after insertion of matter therein. n

3. A duplex envelope comprising a rectangular blank comprising a front section and a pair of opposed foldable portions for forming the back of an envelope compartment, a closing member extending entirely across one end of the front, a pair of flaps extend ing across the other end of the front, one of said flaps serving to seal a portion of the end of said compartment, a patch having a free and unsecured edge inserted in the fold be-A tween the back and front of the envelope and having a pair of adjacent edges secured to the rear face of the front, the second of the pair of flaps on the front serving as a seal `for the compartment 'formed beneath the patch.

In testimony whereof, I have hereunto subscribed my name this 6th day of June, 1927.

WALTER J. BNDER. 

